121889 has 2 divisors, whose sum is σ = 121890. Its totient is φ = 121888.

The previous prime is 121883. The next prime is 121909. The reversal of 121889 is 988121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67600 + 54289 = 260^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 121889 - 2⁸ = 121633 is a prime.

It is not a weakly prime, because it can be changed into another prime (121883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60944 + 60945.

It is an arithmetic number, because the mean of its divisors is an integer number (60945).

2¹²¹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

121889 is a deficient number, since it is larger than the sum of its proper divisors (1).

121889 is an equidigital number, since it uses as much as digits as its factorization.

121889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 29.

The square root of 121889 is about 349.1260517349. The cubic root of 121889 is about 49.5817104350.

The spelling of 121889 in words is "one hundred twenty-one thousand, eight hundred eighty-nine".